linux-kernel - [PATCH v4 2/9] arm: mm: dma-mapping: Convert to use vm_map

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Date:   Fri, 15 Feb 2019 08:13:29 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     akpm@...ux-foundation.org, willy@...radead.org, mhocko@...e.com,
        linux@...linux.org.uk, robin.murphy@....com,
        iamjoonsoo.kim@....com, treding@...dia.com, keescook@...omium.org,
        m.szyprowski@...sung.com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 2/9] arm: mm: dma-mapping: Convert to use vm_map_pages()

Convert to use vm_map_pages() to map range of kernel
memory to user vma.

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
---
 arch/arm/mm/dma-mapping.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index f1e2922..de7c76e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1575,31 +1575,21 @@ static int __arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma
 		    void *cpu_addr, dma_addr_t dma_addr, size_t size,
 		    unsigned long attrs)
 {
-	unsigned long uaddr = vma->vm_start;
-	unsigned long usize = vma->vm_end - vma->vm_start;
 	struct page **pages = __iommu_get_pages(cpu_addr, attrs);
 	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	unsigned long off = vma->vm_pgoff;
+	int err;
 
 	if (!pages)
 		return -ENXIO;
 
-	if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
+	if (vma->vm_pgoff >= nr_pages)
 		return -ENXIO;
 
-	pages += off;
-
-	do {
-		int ret = vm_insert_page(vma, uaddr, *pages++);
-		if (ret) {
-			pr_err("Remapping memory failed: %d\n", ret);
-			return ret;
-		}
-		uaddr += PAGE_SIZE;
-		usize -= PAGE_SIZE;
-	} while (usize > 0);
+	err = vm_map_pages(vma, pages, nr_pages);
+	if (err)
+		pr_err("Remapping memory failed: %d\n", err);
 
-	return 0;
+	return err;
 }
 static int arm_iommu_mmap_attrs(struct device *dev,
 		struct vm_area_struct *vma, void *cpu_addr,
-- 
1.9.1